mystr = "hello world and itcat and itheima and Python"

# 1. find()
print(mystr.find('and')) #12
print(mystr.find('and', 15, 30)) # 23
print(mystr.find('ands')) # -1, and子串不存在

# 2 index()
# print(mystr.index('and')) # 12
# print(mystr.index('and', 15, 30))   # 23
# print(mystr.index('ands')) # 如果index查找子串不存在，报错

# 3.count()
# print(mystr.count('and', 15, 30))
# print(mystr.count('and')) # 3
# print(mystr.count('ands'))

# 4.rfind()
# print(mystr.rfind('and'))
print(mystr.rfind('ands'))

# 5.rindex()
print(mystr.rindex('and'))
# print(mystr.index('ands'))








